1. The problem statement, all variables and given/known data A 50-kg mass is dropped from a 20-m height onto a very long, initially uncompressed spring of force constant k = 100 N/m 2. Relevant equations Ueo=Ugf+Uef F=k(Lenght Final-length initial) 3. The attempt at a solution I tried using Ueo=Ugf+Uef, and i couldnt figure out what to use for some of the values. so far i got 1/2*4.9^2=Ugf+Uef, i dont know what to put for the final heights.